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White LED driver provides 92 percent efficiency

Posted: 06 Dec 2004 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? led driver? ltc3216?

Linear Technology Corp. released a fractional charge pump, high current white LED driver that delivers up to 1A of LED current.

According to the company, the LTC3216's high efficiency multi-mode architecture automatically switches between 1X, 1.5X or 2X boost modes by monitoring the voltage across the LED current source and switching modes only when ILED dropout is detected. This enables the LED driver to maximize efficiency (up to 92 percent) throughout the entire Li-ion operating range, added Linear Tech. A 900kHz switching frequency and a low external parts count (two flying capacitors, two programming resistors and two bypass capacitors at VIN and CPO) provide a tiny footprint suitable for video and flash applications in camera phones and other portable lighting applications.

The LTC3216 employs built-in soft-start circuitry which prevents excessive inrush current during start-up. Independent high and low current settings for flash and torch/video modes, respectively, are programmed by two external resistors. Shutdown mode and current output levels are selected via two logic inputs. In addition, an ultra-low dropout current source maintains accurate LED current as the input voltage approaches the LED forward voltage.

With prices starting at $2 each for 1,000-piece quantities, the LTC3216 is available in a low profile (0.75mm) 3-by-4mm 12-lead DFN package.

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